It is directly relative to the work performances and economy of full casing boring with grab equipment that the percussive grab and casings are reasonable designed and selected.

Based on making investigation into engineering practice, design and construction method building impervious wall for cased bore-hole impact grab is epitomized and summarized .

The paper sketches the course of research and development of "CG percussive grabbing boring equipment with casing",composition and specification of equipment;analyzed construction technology of full-casing cast-in-place pile,bitten piles and replacement stone column;sums up the field cases and development prospect.

This paper introduces the quality control for cased borehole cast in situ from the pile of control,operating conditions for control,consturction control and other aspects,and gives examples of a project.